115 lines
3.2 KiB
JavaScript
115 lines
3.2 KiB
JavaScript
import attributes from "./attributes";
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function point(x, y) {
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this.x = this.round(x);
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this.y = this.round(y);
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this.attributes = new attributes();
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}
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/** Rounds a value to PRECISION */
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point.prototype.round = function(value) {
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return Math.round(value * 1e2) / 1e2;
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};
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/** Radians to degrees */
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point.prototype.rad2deg = function(radians) {
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return radians * 57.29577951308232;
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};
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/** Degrees to radians */
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point.prototype.deg2rad = function(degrees) {
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return degrees / 57.29577951308232;
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};
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/** Adds an attribute. This is here to make this call chainable in assignment */
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point.prototype.attr = function(name, value) {
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this.attributes.add(name, value);
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return this;
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};
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/** Returns the distance between this point and that point */
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point.prototype.dist = function(that) {
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let dx = this.x - that.x;
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let dy = this.y - that.y;
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return this.round(Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2)));
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};
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/** Returns slope of a line made by this point and that point */
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point.prototype.slope = function(that) {
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return (that.y - this.y) / (that.x - this.x);
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};
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/** Returns the x-delta between this point and that point */
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point.prototype.dx = function(that) {
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return that.x - this.x;
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};
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/** Returns the y-delta between this point and that point */
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point.prototype.dy = function(that) {
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return that.y - this.y;
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};
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/** Returns the angle between this point and that point */
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point.prototype.angle = function(that) {
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let rad = Math.atan2(-1 * this.dy(that), this.dx(that));
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while (rad < 0) rad += 2 * Math.PI;
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return this.rad2deg(rad);
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};
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/** Rotate this point deg around that point */
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point.prototype.rotate = function(deg, that) {
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let radius = this.dist(that);
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let angle = this.angle(that);
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let x = that.x + radius * Math.cos(this.deg2rad(angle + deg)) * -1;
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let y = that.y + radius * Math.sin(this.deg2rad(angle + deg));
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return new Point(x, y);
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};
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/** returns an identical copy of this point */
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point.prototype.copy = function() {
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return new Point(this.x, this.y);
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};
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/** checks whether this point is equal to that point */
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point.prototype.equals = function(that) {
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return this.x === that.x && this.y === that.y ? true : false;
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};
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/** Mirrors this point around X value of that point */
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point.prototype.flipX = function(that) {
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return new Point(that.x + this.dx(that), that.y);
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};
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/** Mirrors this point around Y value of that point */
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point.prototype.flipY = function(that) {
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return new Point(that.x, that.y + this.dy(that));
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};
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/** Shifts this point distance in the deg direction */
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point.prototype.shift = function(deg, distance) {
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let p = this.copy();
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p.x += distance;
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return p.rotate(deg, this);
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};
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/** Shifts this point distance in the direction of that point */
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point.prototype.shiftTowards = function(that, distance) {
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return this.shift(this.angle(that), distance);
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};
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/** Shifts this point fraction of the distance towards that point */
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point.prototype.shiftFractionTowards = function(that, fraction) {
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return this.shiftTowards(that, this.dist(that) * fraction);
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};
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/** Shifts this point distance beyond that point */
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point.prototype.shiftOutwards = function(that, distance) {
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return this.shiftTowards(that, this.dist(that) + distance);
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};
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export default point;
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